Apache HTTP Server <=2.4.39 - HTML Injection/Partial Cross-Site Scripting

mediumseverity

6.1CVSS score

81.5%likelihood of exploitation, next 30 days

100%of all CVEs are less likely

Readycheck to confirm it

Apache HTTP Server versions 2.4.0 through 2.4.39 are vulnerable to a limited cross-site scripting issue affecting the mod_proxy error page. An attacker could cause the link on the error page to be malformed and instead point to a page of their choice. This would only be exploitable where a server was set up with proxying enabled but was misconfigured in such a way that the Proxy Error page was displayed.

Impact

Successful exploitation of this vulnerability could allow an attacker to inject malicious HTML code or execute arbitrary JavaScript code in the context of the victim's browser, potentially leading to session hijacking, defacement, or theft of sensitive information.

Fix

Upgrade to Apache HTTP Server version 2.4.40 or later, which includes a fix for this vulnerability.

How to confirm it

Send: GET {{BaseURL}}/%5cgoogle.com/evil.html
Positive when: contains "Proxy Error" AND contains "<a href=\"/\\google.com/evil.html\">"

Run it with nuclei: nuclei -id CVE-2019-10092 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2019-10092

info:
  name: Apache HTTP Server <=2.4.39 - HTML Injection/Partial Cross-Site Scripting
  author: pdteam
  severity: medium
  description: Apache HTTP Server versions 2.4.0 through 2.4.39 are vulnerable to a limited cross-site scripting issue affecting the mod_proxy error page. An attacker could cause the link on the error page to be malformed and instead point to a page of their choice. This would only be exploitable where a server was set up with proxying enabled but was misconfigured in such a way that the Proxy Error page was displayed.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to inject malicious HTML code or execute arbitrary JavaScript code in the context of the victim's browser, potentially leading to session hijacking, defacement, or theft of sensitive information.
  remediation: |
    Upgrade to Apache HTTP Server version 2.4.40 or later, which includes a fix for this vulnerability.
  reference:
    - https://github.com/DrunkenShells/Disclosures/tree/master/CVE-2019-10092-Limited%20Cross-Site%20Scripting%20in%20mod_proxy%20Error%20Page-Apache%20httpd
    - https://httpd.apache.org/security/vulnerabilities_24.html
    - https://lists.debian.org/debian-lts-announce/2019/09/msg00034.html
    - https://nvd.nist.gov/vuln/detail/CVE-2019-10092
    - http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00004.html
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2019-10092
    cwe-id: CWE-79
    epss-score: 0.81466
    epss-percentile: 0.99643
    cpe: cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: apache
    product: http_server
    shodan-query:
      - cpe:"cpe:2.3:a:apache:http_server"
      - apache 2.4.49
  tags: cve,cve2019,apache,htmli,injection,vuln

http:
  - method: GET
    path:
      - '{{BaseURL}}/%5cgoogle.com/evil.html'

    matchers-condition: and
    matchers:
      - type: word
        words:
          - "Proxy Error"

      - type: word
        words:
          - "<a href=\"/\\google.com/evil.html\">"

References

Use this check only on systems you are authorised to test. Where the data comes from